EP2740716A1 - Application of hybrid systems MgO-SiO2 / multiwalled olygomeric silsesquioxanes as promoters of ceramization in silicone composites for covers of electrical cables - Google Patents
Application of hybrid systems MgO-SiO2 / multiwalled olygomeric silsesquioxanes as promoters of ceramization in silicone composites for covers of electrical cables Download PDFInfo
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- EP2740716A1 EP2740716A1 EP20130460078 EP13460078A EP2740716A1 EP 2740716 A1 EP2740716 A1 EP 2740716A1 EP 20130460078 EP20130460078 EP 20130460078 EP 13460078 A EP13460078 A EP 13460078A EP 2740716 A1 EP2740716 A1 EP 2740716A1
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- ceramization
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- olygomeric
- multiwalled
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- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 238000002468 ceramisation Methods 0.000 title claims abstract description 14
- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 12
- 229910017970 MgO-SiO2 Inorganic materials 0.000 title 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- -1 methacryloxy- Chemical class 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 12
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 8
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 7
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 6
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 6
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 6
- 239000000391 magnesium silicate Substances 0.000 claims abstract description 5
- 229910052919 magnesium silicate Inorganic materials 0.000 claims abstract description 5
- 235000019792 magnesium silicate Nutrition 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 4
- 230000004048 modification Effects 0.000 claims abstract description 3
- 238000012986 modification Methods 0.000 claims abstract description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 7
- 229910052697 platinum Inorganic materials 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910021485 fumed silica Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- RCNRJBWHLARWRP-UHFFFAOYSA-N ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane;platinum Chemical compound [Pt].C=C[Si](C)(C)O[Si](C)(C)C=C RCNRJBWHLARWRP-UHFFFAOYSA-N 0.000 description 2
- 229910052839 forsterite Inorganic materials 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000005055 methyl trichlorosilane Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000005054 phenyltrichlorosilane Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- FKHIFSZMMVMEQY-UHFFFAOYSA-N talc Chemical compound [Mg+2].[O-][Si]([O-])=O FKHIFSZMMVMEQY-UHFFFAOYSA-N 0.000 description 1
- ORVMIVQULIKXCP-UHFFFAOYSA-N trichloro(phenyl)silane Chemical compound Cl[Si](Cl)(Cl)C1=CC=CC=C1 ORVMIVQULIKXCP-UHFFFAOYSA-N 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/19—Alkali metal aluminosilicates, e.g. spodumene
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- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/20—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in magnesium oxide, e.g. forsterite
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
- C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
- C04B2235/483—Si-containing organic compounds, e.g. silicone resins, (poly)silanes, (poly)siloxanes or (poly)silazanes
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
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- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
Definitions
- the subject of invention is application of hybrid systems MgO•SiO 2 / multiwalled olygomeric silsesquioxanes as promoters of ceramization in silicone composites destined for covers of electrical cables.
- silicone composites containing inorganic particles undergoing ceramization on fire, is commonly known in the cable industry. It is aimed to produce fire resistant electrical cables, which are able to provide electricity supply to electrical circuits and receivers during fire. They can find use in buildings or other objects of higher fire requirements therefore ensure increased safety during fire.
- Such composites are made of silicone elastomers filled with pyrogenic silica. They are able to thermal vulcanization under the influence of organic peroxides, antypirenes and metallic or mineral compounds being ceramically active at high temperature.
- Promoters and activators of ceramization process are very important components of ceramizable silicone composites, responsible for initiation and support of ceramic skeleton formation, which preserves cable cover from destruction during fire. With increasing temperature, organic parts of polymer phase degrade and ceramically active components of mineral phase are not able to assure expected mechanical strength of the material only by adhesion forces.
- the high rate of ceramization of the composite material makes thereby the outer, formed under high temperature, ceramic layer of cable cover, very effective in thermal insulation. It positively affects the sustainability of the physical properties of the cover and formation of ceramic layer of advantageous mechanical properties, what results in prolonged functionality of electrical cables on fire or the action of high temperature.
- silica as a precursor of ceramization is known from the publication " Ceramic - modified elastomers", published in Current Opinion in Solid State and Materials Science 1999, vol. 4, pp. 565 - 570, by J.E. Mark .
- use of silica nanoparticles brings about some technical limitations associated with high cost of their production and problems of dispersion in non-polar silicone polymer phase.
- Hybrid systems composed of silicate base and from 0.1 to 50 weight parts, preferably 10 weight parts, of silsesquioxanes containing R 1 - R 8 , where R 1 to R 8 is alkyl- group and/or groups, or alkoxy-, or methacryloxy-, orglycidoxy-, or amino-, orvinyl-, or perfluoro- or their mixture, are known from the Polish patent declaration P-394903 . They are synthesized by chemical functionalization of the filler surface with alkoxysilanes, followed by mechanical and chemical modification.
- the essence of the invention is application of the hybrid systems M g O•SiO 2 /multiwalled olygomeric silsesquioxanes, in silicone composites containing magnesium silicate and from 0.1 to 50 weight parts of the silsesquioxanes containing R 1 - R 8 , where R 1 to R 8 is alkyl- group and/or groups, or alkoxy-, or methacryloxy-, or glycidoxy-, or amino-, or vinyl-, or perfluoro- or their mixture, used for its modification, as promoters of ceramization in the silicone composites destined for covers of electrical cables.
- the amount of platinum catalyst added assured platinum content in the elastomer equal to 50 ppm.
- Silica filled polymer phase is then cooled down to temperature 110°C, and 45 weight parts of quartz powder, 5 weight parts of wollastonite, 2 weight parts of titanium dioxide and 5 weight parts of the hybrid systems MgO•SiO 2 /multiwalled olygomeric silsesquioxanes, containing 10 weight parts of silsesquioxane octa-substituted with methacrylo- groups on 100 weight parts of magnesium silicate filler, are admixed.
- silicone composite subjected to curing with 1.5 weight % of bis(2,4-dichlorobenzoyl) peroxide during 15 minutes at 120 °C, exhibits the properties listed below: Results Requirements of cable industry Tensile strength [MPa] 7.7 min. 5.0 Elongation at break [%] 247 min. 150 Tear strength [kN/m] 16 min. 12 Hardness [°Sh A] 64 70 ⁇ 5 Time to ceramization of cured composite under the flame from gas burner at 1050 °C [s] below 60
- the amount of platinum catalyst added assured platinum content in the elastomer equal to 50 ppm.
- Silica filled polymer phase is then cooled down to temperature 80°C, and 35 weight parts of potassium mica, 10 weight parts of aluminum hydroxide, 3 weight parts of magnesium hydroxide, 2 weight parts of titanium dioxide and 8 weight parts of the hybrid systems MgO•SiO 2 /multiwalled olygomeric silsesquioxanes, containing 20 weight parts of silsesquioxane octa-substituted with methacrylo- groups on 100 weight parts of magnesium silicate filler, are admixed.
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Abstract
Description
- The subject of invention is application of hybrid systems MgO•SiO2 / multiwalled olygomeric silsesquioxanes as promoters of ceramization in silicone composites destined for covers of electrical cables.
- Application of silicone composites containing inorganic particles, undergoing ceramization on fire, is commonly known in the cable industry. It is aimed to produce fire resistant electrical cables, which are able to provide electricity supply to electrical circuits and receivers during fire. They can find use in buildings or other objects of higher fire requirements therefore ensure increased safety during fire.
- Such composites are made of silicone elastomers filled with pyrogenic silica. They are able to thermal vulcanization under the influence of organic peroxides, antypirenes and metallic or mineral compounds being ceramically active at high temperature.
- Promoters and activators of ceramization process are very important components of ceramizable silicone composites, responsible for initiation and support of ceramic skeleton formation, which preserves cable cover from destruction during fire. With increasing temperature, organic parts of polymer phase degrade and ceramically active components of mineral phase are not able to assure expected mechanical strength of the material only by adhesion forces.
- Activity of promoters and precursors plays also an important role in the rate of ceramic layer formation of the cable cover. According to actual state-of-the art it should meet expected mechanical properties at the temperature of 900 - 1100°C and no later than after 60 s.
- The high rate of ceramization of the composite material makes thereby the outer, formed under high temperature, ceramic layer of cable cover, very effective in thermal insulation. It positively affects the sustainability of the physical properties of the cover and formation of ceramic layer of advantageous mechanical properties, what results in prolonged functionality of electrical cables on fire or the action of high temperature.
- Application of fme particles silica as a precursor of ceramization is known from the publication "Ceramic - modified elastomers", published in Current Opinion in Solid State and Materials Science 1999, vol. 4, pp. 565 - 570, by J.E. Mark. However, use of silica nanoparticles brings about some technical limitations associated with high cost of their production and problems of dispersion in non-polar silicone polymer phase.
- Able to oxidation compounds of magnesium, chemically reacting at high temperature with silica and/or aluminum compounds and producing such minerals as forsterite (Mg2SiO4), magnesium silicate (MgSiO3), cordierite (2Mg•2Al2O3-5SiO2), spinel (MgAl2O4), which are the components of the ceramic outer layer formed, are known from the patent declaration
US 2009/0099289 . Important drawback of the above solution concerns the fact, that magnesium oxide, produced in high temperature oxidation of magnesium compounds, should quantitatively react up with silica and/or other components of mineral phase. Otherwise, the unreacted magnesium oxide left can adversely affect electrical insulation properties of cable cover. - The above problem does not occur if, products of hydrolysis of phenyltrichlorosilane (C6H5SiCl3) and methyltrichlorosilane (CH3SiCl3), synthesized by known methods - described in the patent declaration P-397997, are used as precursor of ceramization.
- In the patent declaration P-397998, another precursor of ceramization, namely tetraethoxysilane adsorbed on the surface of diatomite powder, has been presented. At the temperature of 120±10°C, under the influence of water contained in diatomite powder, rapid hydrolytic destruction of tetraethoxysilane occurs, resulting in highly reactive nanosilica particles formation on the surface of diatomite particles. Simultaneously an excess of moisture and ethanol, produced in the hydrolysis reaction, is evaporating.
- Hybrid systems composed of silicate base and from 0.1 to 50 weight parts, preferably 10 weight parts, of silsesquioxanes containing R1 - R8, where R1 to R8 is alkyl- group and/or groups, or alkoxy-, or methacryloxy-, orglycidoxy-, or amino-, orvinyl-, or perfluoro- or their mixture, are known from the Polish patent declaration
P-394903 - The essence of the invention is application of the hybrid systems MgO•SiO2/multiwalled olygomeric silsesquioxanes, in silicone composites containing magnesium silicate and from 0.1 to 50 weight parts of the silsesquioxanes containing R1 - R8, where R1 to R8 is alkyl- group and/or groups, or alkoxy-, or methacryloxy-, or glycidoxy-, or amino-, or vinyl-, or perfluoro- or their mixture, used for its modification, as promoters of ceramization in the silicone composites destined for covers of electrical cables.
- Application of the above mentioned hybrid systems makes possible to obtain a composite mix of high susceptibility to ceramization, which is able to produce well developed ceramic layer, effectively protecting metal wire of electrical cable from heat transfer and possible melting during fire.
- 40 weight parts of pyrogenic silica, having the specific surface area of 200 m2/g and platinum catalyst in the form of platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane are admixed to 100 weight parts of dimethyl-vinyl siliconeof average molecular weight Mw= 680 000 and vinyl group content of 0.07 %, at 140°C. The amount of platinum catalyst added assured platinum content in the elastomer equal to 50 ppm. Silica filled polymer phase is then cooled down to temperature 110°C, and 45 weight parts of quartz powder, 5 weight parts of wollastonite, 2 weight parts of titanium dioxide and 5 weight parts of the hybrid systems MgO•SiO2/multiwalled olygomeric silsesquioxanes, containing 10 weight parts of silsesquioxane octa-substituted with methacrylo- groups on 100 weight parts of magnesium silicate filler, are admixed.
- Prepared in this way silicone composite, subjected to curing with 1.5 weight % of bis(2,4-dichlorobenzoyl) peroxide during 15 minutes at 120 °C, exhibits the properties listed below:
Results Requirements of cable industry Tensile strength [MPa] 7.7 min. 5.0 Elongation at break [%] 247 min. 150 Tear strength [kN/m] 16 min. 12 Hardness [°Sh A] 64 70±5 Time to ceramization of cured composite under the flame from gas burner at 1050 °C [s] below 60 - 40 weight parts of pyrogenic silica, having the specific surface area of 200 m2/g and platinum catalyst in the form of platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane are admixed to 100 weight parts of dimethyl-vinyl silicone of average molecular weight Mw = 680 000 and vinyl group content of 0.12 %, at 140°C. The amount of platinum catalyst added assured platinum content in the elastomer equal to 50 ppm. Silica filled polymer phase is then cooled down to temperature 80°C, and 35 weight parts of potassium mica, 10 weight parts of aluminum hydroxide, 3 weight parts of magnesium hydroxide, 2 weight parts of titanium dioxide and 8 weight parts of the hybrid systems MgO•SiO2/multiwalled olygomeric silsesquioxanes, containing 20 weight parts of silsesquioxane octa-substituted with methacrylo- groups on 100 weight parts of magnesium silicate filler, are admixed.
- Prepared in this way silicone composite, subjected to curing with 1.5 weight % of bis(2,4-dichlorobenzoyl)peroxide during 15 minutes at 120 °C, exhibits the properties listed below:
Results Requirements of cable industry Tensile strength [MPa] 6.1 min. 5.0 Elongation at break [%] 207 min. 150 Tear strength [kN/m] 18 min. 12 Hardness [°Sh A] 73 70±5 Time to ceramization of cured composite under the flame from gas burner at 1050 °C [s] below 60
Claims (1)
- Application of the hybrid systems MgO•SiO2/multiwalled olygomeric sisesquioxanes, in silicone composites containing magnesium silicate and from 0.1 to 50 weight parts of the silsesquioxanes, favourably 10 weight parts, containing R1 - R8, where R1 to R8 is alkyl- group and/or groups, or alkoxy-, or methacryloxy-, orglycidoxy-, or amino-, or vinyl-, or perfluoro- or their mixture, used for its modification, as promoters of ceramization in the silicone composites destined for covers of electrical cables.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PL401810A PL219849B1 (en) | 2012-11-29 | 2012-11-29 | The use of hybrid MgO.SiO <sub> 2 /polyhedral oligomeric silsesquioxanes as promoters of ceramization in silicon composites for covering electrical wires</sub> |
Publications (2)
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EP2740716A1 true EP2740716A1 (en) | 2014-06-11 |
EP2740716B1 EP2740716B1 (en) | 2015-01-21 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114989617A (en) * | 2022-06-06 | 2022-09-02 | 浙江葆润应用材料有限公司 | Preparation method of ceramic silicon rubber material with high weather resistance |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090099289A1 (en) | 2006-04-21 | 2009-04-16 | Graeme Alexander | Fire Resistant Compositions |
PL394903A1 (en) | 2011-05-17 | 2012-11-19 | Politechnika Poznanska | Hybrid systems MgO·SiO₂/polyhedral oligomeric silesquioxanes and process for the preparation thereof by initial chemical functionalization with alkoxysilanes, and mechanical and chemical modification |
-
2012
- 2012-11-29 PL PL401810A patent/PL219849B1/en unknown
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2013
- 2013-11-26 EP EP20130460078 patent/EP2740716B1/en not_active Not-in-force
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090099289A1 (en) | 2006-04-21 | 2009-04-16 | Graeme Alexander | Fire Resistant Compositions |
PL394903A1 (en) | 2011-05-17 | 2012-11-19 | Politechnika Poznanska | Hybrid systems MgO·SiO₂/polyhedral oligomeric silesquioxanes and process for the preparation thereof by initial chemical functionalization with alkoxysilanes, and mechanical and chemical modification |
Non-Patent Citations (2)
Title |
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DAMIAN AMBROZEWICZ ET AL: "New POSS/magnesium silicate nano-hybrids obtained by chemical or mechanical methods", CHEMICAL ENGINEERING JOURNAL, vol. 210, 30 August 2012 (2012-08-30), pages 229 - 236, XP055113413, ISSN: 1385-8947, DOI: 10.1016/j.cej.2012.08.075 * |
J.E. MARK: "Ceramic - modified elastomers", CURRENT OPINION IN SOLID STATE AND MATERIALS SCIENCE, vol. 4, 1999, pages 565 - 570 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114989617A (en) * | 2022-06-06 | 2022-09-02 | 浙江葆润应用材料有限公司 | Preparation method of ceramic silicon rubber material with high weather resistance |
CN114989617B (en) * | 2022-06-06 | 2023-05-02 | 浙江葆润应用材料有限公司 | Preparation method of ceramic silicone rubber material with strong weather resistance |
Also Published As
Publication number | Publication date |
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PL401810A1 (en) | 2013-06-10 |
PL219849B1 (en) | 2015-07-31 |
EP2740716B1 (en) | 2015-01-21 |
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